I love Ridley. Really I do. I want to believe in his inclusion, and I'm slowly becoming more confident in his inclusion.
But the whole "100% confident" thing is getting your hopes up way too high. There's quite a bit going in Ridley's favor, but in the other side's defense Ridley was shown off during the boss portion of the Direct, obviously hinting that he is in fact a boss.
Now Sakurai has done some pretty weird things, so him lying about Ridley is certainly up his alley (also considering that there is more than one Ridley, but again I think that the Ridley we saw is playable or else he's a boss). In conclusion, I wouldn't be so confident. I'm staying neutral (leaning towards yes) on the situation so that I don't set myself up for possible disappointment if Ridley is in fact a hazard.
I admire everyone's loyalty towards Ridley, but it has to be toned down a little bit. It's to the point that people look down on the Ridley fanbase, when in reality it's just people rooting for a character that they love. It's quite sad, and it will be even more so if Ridley's fate is a stage boss. I've prepared myself for the possibility, and in all honesty I probably won't be incredibly upset. When I first saw Ridley's shadow in the Direct I thought he was done for, and all I said was "oh no, Ridley!" I was sad, but there are many other characters that would make this game awesome for me. Little Mac is in, Palutena and Mewtwo are really likely, and K. Rool is always a possibility. I'm honestly not sure what to think about Ridley, but I know what I'm hoping for.
Not sure why I typed this up, I guess I just felt my opinion had to be heard.